Sunday, February 24, 2013

Another super-simple circuit. You could use this circuit to drive a low power
speaker from a sound effects module or a noise generator.
Or you could build your own amplified speakers for use with your computer.
As shown (with no gain setting network between pins 1 and 8) the circuit amplifies
the input signal by 20X.
A gain of 200X can be obtained by connecting a 10uF capacitor between pins 1 and 8.
Connect a resistor in series with the 10uF capacitor for intermediate gain values.
A 1.2K series resistor, for example, results in a gain of 50X.